What is the use of Interface ?

What is the use of Interface ? ,Java, C ,C++, ASP, ASP.net C# ,Struts ,Questions & Answer, Struts2, Ajax, Hibernate, Swing ,JSP , Servlet, J2EE ,Core Java ,Stping, VC++, HTML, DHTML, JAVASCRIPT, VB ,CSS, interview ,questions, and answers, for,experienced, and fresher

Interface provides service details not the implementation details to the user.
�It is used to achieve full abstraction.
�By interface, we can achieve multiple inheritance.

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